Putty hacking knife

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A robust and durable Hacking Knife will serve you for months and years to come. You will also find out how to remove and replace window pins and nails easily without damaging any glass. Don't want to do this job yourself? Let us help you find a tradesman local to you. Essentially, removing single pane glazing is as simple as prying away any old putty or glazing compound from the window frame and softening any stubborn areas with a heat gun or linseed oil as required.

Once the putty is gone, remove any glass retaining nails and then the glass should pop straight out. This may sound like a very simply straight forward job, but if you have never done it before there is a fairly wide scope for things to go wrong, so read on below for tips on how to remove old putty with the minimum of fuss. Back in the days before upvc and double glazing, windows were traditionally formed by using either steel usually galvanized or timber to build the frame and a single pane of glass was dropped into it.

Small nails or spriggs as they are also known were then hammered down into the frame to hold the glass in place. The glazing putty is simply there to seal the glass to the frame and prevent any draughts or water ingress into the frame. If your windows are particularly old and have never, or at least not in the last 30 years, had the putty replaced then there is a chance that the putty itself may contain asbestos. If there is even the slimmest of chances that this may be the case then you should definitely not attempt to touch or disturb the putty in any way!

It will need to be removed by specialists in a controlled manner. For more information on the dangers of asbestos and also on a DIY testing kit that can be used to test any suspect putty for traces, see our project on asbestos here.

Besides the dangers posed by asbestos, you also need to be aware of the dangers posed by lead paint. To find out more about lead paint and how to strip it safely, see our project on stripping lead paint here.

As we have established, this is a bit of a tricky, delicate and time consuming job that essentially involves prying or hammering next to a thin pane of glass — a recipe for disaster! As with any DIY job and this is no exception, always wear suitable protective gear and clothing. Decent hand any eye protection is an absolute must. To make the job a little easier, if you can, remove the whole window and frame so that you can work on it on a flat level surface.

This will make things a little easier. With the window removed find a nice solid and level bench to place it on. A purpose built workbench is best but a Workmate or similar will also be perfectly fine.

Ensure that no areas of the glass itself are resting on anything. If they are, the second any pressure is applied the glass will break. When clamping up, try to clamp using the centre of the window frame and again, ensure that none of the glass is under any pressure. Tip : Place a thick sheet or blanket between your window and your work surface before clamping it down. This will help to absorb any vibrations caused when hammering that could potentially crack the glass. If you unable to remove the window you will have to work on it where it is.

This makes things a little more difficult, but certainly not impossible. Old galvanized steel window needing urgent putty replacement — The window could not be removed so had to be repaired where it was. This will make getting the putty off much easier. Before putting a hammer straight through it, put on some decent eye protectors and thick cut resistant glove and then place an old thick sheet or towel over the glass covering it fully and gently tap it with a hammer to break it up.

Once all broken up, pull any remaining shards out with your gloves on and collect up as much of the glass as possible and dispose of it. If you are definitely wanting to save your pane of glass, firstly using a razor blade or sharp knife, run it around the very edge of the putty where it meets the glass to break the seal. Repeat this for several passes, applying a little pressure each time to edge further into the putty.

Using a hammer, gently tap on the flat edge of the knife until you see it cutting into the putty. The hacking knife is deliberately not razor sharp to prevent damage to the frame which always happens if you use a wood chisel.

Keep tapping the hacking knife down towards the frame and the chunks will ping off. You will soon get used to how hard you can hit it. Which ever way your frame is lying, always hit down towards the frame. Never hit down towards the glass or you will smash it. Once you have removed a chunk of putty you should be able to see how deep it is and where the frame is so that you know exactly how deep you can hit the knife down without accidentally chopping into the frame.

Continue chopping away the old putty along the surround, ensuring that you get right down into each corner. Make sure that you get the hacking knife right down into each corner to remove all the window putty.

Carefully work your way around the perimeter of the glass, chopping out any and all putty with the hacking knife as you go until all putty has been removed.

To soften any hard putty you can use a heat gun. Heating the putty up will cause it to go soft and make removing it much easier. Run the heat gun over the putty from side to side, being careful not to concentrate any heat in one spot for too long as if glass gets too hot it will crack. You can use some thick pieces of timber cut to length to shield the glass from the direct heat from the gun. With all the major chunks of putty removed, the next job is to go around the frame and remove any small lumps or bumps that remain.

This is an essential step if you are hoping to remove any glass in one piece without damage as even the smallest of lumps is enough to prevent the glass from moving freely.